Effect of age on left atrial function in patients with coronary artery disease

Area of Science:

• Cardiology
• Gerontology
• Physiology

Background:

• Coronary artery disease (CAD) and aging can lead to left ventricular diastolic dysfunction.
• Left ventricular diastolic dysfunction is characterized by impaired relaxation and filling of the left ventricle.
• Increased left atrial (LA) activity is often observed in conjunction with diastolic dysfunction.

Purpose of the Study:

• To investigate the impact of aging and coronary artery disease on left ventricular diastolic function.
• To analyze the relationship between age, left atrial size, and Doppler left ventricular filling patterns in patients with CAD.
• To understand the combined effects of aging and disease on left atrial function and structure.

Main Methods:

• Studied 75 patients (age 40-91 years) with coronary artery disease.
• Utilized Doppler echocardiography to assess left ventricular filling patterns.
• Analyzed correlations between age, left atrial diameter, and diastolic function parameters (isovolumic relaxation time, peak atrial flow velocity, atrial filling fraction).

Main Results:

• Found linear correlations between age and isovolumic relaxation time, peak atrial flow velocity, and atrial filling fraction.
• Demonstrated independent effects of age and left atrial size on these diastolic parameters.
• Observed that left atrial function indexes initially increased with minor LA dilation but decreased with further dilation, particularly in older patients.

Conclusions:

• Both aging and coronary artery disease contribute to left ventricular diastolic dysfunction.
• Age and left atrial dilation are significant independent factors influencing diastolic function in CAD patients.
• Combined effects of aging and disease on left atrial wall stress likely cause dilation and dysfunction in the elderly CAD population.